JPS59137930A - Color optical printer head - Google Patents

Abstract

PURPOSE:To prevent formation of black or white lines on a print by covering the entire surface on the liquid crystal side of transparent electrodes with color filters of different colors and forming a light shielding layer which prohibits the transmission of at least white color on the peripheries of the electrodes. CONSTITUTION:A liquid crystal shutter array 20 has the construction in which plura transparent electrode arrays 25, 26, 35, 36 and 45, 46 corresponding to different colors are provided between glass substrates 21 and 22 and a liquid crystal 60 is sandwiched between the substrates. Polarizing plates 23, 24 are mounted respectively on the transparent electrode side and the opposite side. The electrodes 25, 26, etc. are arranged in a dot matrix type and can therefore display optional characters, figures, etc. The entire surface of the electrodes 26, 36, 46 is coated with color filters B, G, R of respectively different colors and the color filters B, G, R cover the entire surface of the one glass substrate 22 as the light shielding layer prohibiting the passage of white light by overlapping on each other and therefore the leakage of the while light through the filters B, G, R is obviated. The formation of white or black lines on photosensitive paper is thus prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color optical printer head for color printing characters, figures, etc. on a photosensitive material using light, and more particularly to an optical shutter device suitable for application to a color hard copy device.

Currently, liquid crystal elements are widely used as numeric displays in calculators and watches, and development into dot-matrix displays that can display alphanumeric characters, kanji, kana characters, images, etc. is progressing. This is a black and white display using the TN (twisted nematic) system. The principle diagram of this TN system is shown in Figure 1 (a) and (b). A nematic liquid crystal is sandwiched between glass substrates 1 and 2, and the molecules 5 of the liquid crystal have their long axes parallel to the substrate surface and are gradually twisted in the thickness direction (when no electric field is applied, as shown in Fig. 1). (b)).Moreover, the twist angle from one glass substrate 1 to the other glass substrate 2 is 90 degrees.Furthermore, in front and behind such a liquid crystal cell, there are polarized lights whose polarization directions are orthogonal to each other. Boards 3, 4
is installed. Therefore, when white light enters such a liquid crystal device from the rear, the light passes through the polarizing plate 3 and is polarized in one direction, and then enters the liquid crystal and propagates along the liquid crystal molecules 5, Its polarization direction is rotated by 90°.

Therefore, the polarization direction of this polarized light and the polarization direction of the front polarizing plate 4 match, and this polarized light is not blocked by the polarizing plate 4.
pass through. On the other hand, when an electric field is applied in the thickness direction of the liquid crystal, the long axes of the liquid crystal molecules 5 are aligned in the direction of the electric field, as shown in FIG. 1(b). Therefore, when white light is incident on the element from behind, the light passes through the polarizing plate 3, is polarized in one direction, and then propagates through the liquid crystal as it is. Therefore, the polarization direction of this polarized light is changed to the front polarizing plate 4.
The light remains orthogonal to the polarization direction of the light, and this light is blocked by the polarizing plate 4.

When an electric field is applied in this way, the liquid crystal cell becomes opaque,
TN liquid crystal is used as a display element by applying the operating principle that a liquid crystal cell becomes transparent when no electric field is applied. However, many of these TN type liquid crystal elements (transparent and opaque) were used for black and white display, so as the application power of liquid crystal elements1 has expanded, colorization has become desirable. This is because novelty, visibility, and diversity can be expected, and some display methods can provide a wide viewing angle.

Color display systems using liquid crystals that utilize various principles have been proposed. A typical example is ECB (electrically
controlled birefringence
) method, GH (guess) method, which adds dichroic dye to liquid crystal.
This allows multicolor display by combining T-filters. That is, two parallel glass substrates 10.
A nematic liquid crystal 12 is sandwiched between the glass substrates 10 and 11, and a strip-shaped transparent electrode 1 is provided on the inner surface of the glass substrate 10.11.
3 and 14 are deposited in large numbers so as to sandwich the liquid crystal 12 and intersect with each other at right angles.

Therefore, by combining the facing portions of the transparent electrodes 13 and 14 and applying an electric field, it is possible to display any shape or pattern, that is, matrix display. Further, color filters B, G, and R are formed on the transparent electrode near the surface of such a liquid crystal element, and on the transparent electrode 13 located at the bottom in the figure, respectively. Here, the color filter R transmits red light, and the color filters B and GJ are additive color filters that transmit green light and blue light, respectively. The reason why the color filters B, U, and H are provided at such positions is that it is easier to obtain high resolution by placing the color filters in close contact with the transparent electrode 14, and also because the transparent electrode 14 is located shallower in front than the transparent electrode 14 in the rear. This is because the color shift is less when viewed from an oblique direction if the color is provided above 13.

By the way, since the liquid crystal becomes transparent and opaque according to the principle shown in FIG. 1, when a transmissive display is adopted as the display method, the liquid crystal functions as a light shutter. A liquid crystal printer head has recently been developed in which a liquid crystal device with such functions is applied to the shutter of a copying machine (Nikkei Electronics, 19B2.5.10 P90-P92
).

This liquid crystal printer head has a structure in which a fluorescent lamp is installed as a light source behind a liquid crystal shutter, and light controlled by the liquid crystal shutter is directed onto a photosensitive drum through an imaging system. The liquid crystal shutter array has 2,000 shutters arranged in a horizontal staggered manner at a pitch of 100 μm, and a resolution of 10 lines/tone has been reported. The development of such an optical printer head is desired because it can provide printing quality comparable to that of semiconductor laser printers and is cheaper than laser printers, but conventional liquid crystal printer heads are only capable of displaying black and white images. It wasn't too much.

Therefore, the inventors of the present invention repeatedly considered colorizing the printer head using the color display method described above, and as they continued their experiments, they found that light leaked from around the transparent electrodes, causing black streaks on the photosensitive paper (negative working photosensitive paper). In the case of positive working photosensitive paper) or white streaks (in the case of positive working photosensitive paper), we have found a problem in which the image quality is significantly impaired.

Therefore, the present invention provides a color liquid crystal device that prevents leakage of white light from around transparent electrodes, and also prevents the occurrence of black or white streaks on prints caused by the process of controlling the on/off of light by a liquid crystal shutter array. Furthermore, it is an object of the present invention to provide a printer head which can obtain a printer with improved color reproduction by preventing color mixing of different colors that may occur between adjacently arranged transparent electrodes (corresponding to pixels). This is the purpose.

The present invention is based on the knowledge obtained in the above-mentioned colorization study experiment that even if light leaks from the periphery of the transparent electrode, it will cause a problem in print image quality.

To prevent white streaks (black streaks in the case of negative working photosensitive paper). Therefore, the basic technology is to devise a practical means to prevent at least white light from reaching the output side from any part other than the transparent electrode section, no matter what optical path it follows from the light source side through this liquid crystal shutter. It is a thought. The structure of the present invention is that in an optical printer head using a liquid crystal shutter array, each electrode surface of a plurality of transparent electrodes forming a color is covered with a color filter of a different color corresponding to Example 44 deeply separated colors, and different colors adjacent to each other are covered. The boiler member 4, which is an example of a transparent electrode for a colorant, is characterized in that a light-shielding layer that does not transmit at least white light is formed. Further, in another configuration of the present invention, each electrode surface of the plurality of transparent electrodes forming the odor array of an optical printer head using a liquid crystal shutter array is memorized with a color filter of a different color corresponding to the separation color. A light-shielding layer that does not transmit at least white light is formed between adjacent transparent electrodes of different coloring agents, and furthermore, the entire surface covered with either the color filter layer or the light-shielding layer is exposed to light. It is characterized by being covered with an invasive layer made of a curable resin.

Hereinafter, the color printer head according to the present invention will be described in detail based on examples.

FIGS. 3 and 4 show an embodiment in which a color liquid crystal device according to the present invention is applied to a liquid crystal printer head as a liquid crystal shutter. The liquid crystal printer head shown in Figure 3 includes a fluorescent lamp as a light source, a liquid crystal shutter that colors the fluorescent light when it passes through, and a self-off lens array that projects the colored light onto color photosensitive paper. equip In other words, a fluorescent lamp (
A liquid crystal shutter 20 is provided in front (lower in FIG. 3) of the camera (not shown). The liquid crystal shutter 20 includes a plurality of transparent electrode arrays 25, 26; 35,
36; and 45. 46: are glass substrates 21° 22 on the inner surface of which are regularly arranged at one-foot intervals in the direction perpendicular to the plane of the paper.
It has a structure in which the liquid crystal 60 is sandwiched between the two.

Polarizing plates 23 and 24 are respectively attached to the outer surfaces of the two glass substrates 21 and 22, that is, the surfaces opposite to the transparent electrode side. The thickness of the glass substrates 21 and 22 is approximately 1 m+ to 2 mm, and the thickness of the liquid crystal 60 is approximately 10 to 20 μm. As mentioned above, when a voltage is applied to this liquid crystal 60,
1. It has optical rotation to rotate the direction of the bit light by 90 degrees, and the polarization directions of the polarizing plates 23 and 24 are orthogonal to each other.

Therefore, only the portion of the liquid crystal to which a voltage is applied transmits light and becomes bright, and the light can be traced to the other portions.Furthermore, a plurality of transparent electrode arrays 25, 26; 35, 36; and 45.46 face each other with the liquid crystal 60 in between, and are regularly arranged at predetermined intervals on each glass substrate. The gap between the electrodes is 20μ
It is about m. Also, the spacing between the arrays is 100 μm or more.
C) About OO~200011m. In general, the material of the transparent electrodes 25, 26, etc. is In, (-1,
A transparent electrode is formed by depositing In, O, on a glass substrate. Since the transparent electrodes 25, 26, etc. are arranged in a dot matrix pattern, arbitrary characters, figures, etc. can be displayed. In this embodiment, the individual transparent electrodes corresponding to the shutter openings corresponding to the unit pixels are arranged independently in a dot matrix shape, but in some cases, the transparent electrodes are arranged through a liquid crystal such as the liquid crystal device shown in FIG. Opposing transparent electrode parts are the upper electrode 13 and the lower electrode 14 in the same mouth.
At least one of them is a common linear electrode, and the part where a predetermined potential is applied to both electrodes (the part where electrodes 13 and 14 cross in a plane) performs a light shutter operation. It goes without saying that the present invention can be similarly applied to liquid crystal shutter arrays as well.

Returning to the description of the above embodiment, one transparent electrode 26.36.4 of each transparent electrode array on one glass substrate 22
6 are color filters H, G, and L whose entire surfaces are of different colors.
Moreover, the ends of the color filters B, G, and H are stacked on the electrode 26 for each electrode up to the gap between different color filter electrodes adjacent to each other on the glass substrate 22. Part color filter B, G
, R function as original color filters, while the color filters U, G, and R formed between the electrodes overlap each other and are provided as a light-shielding layer that does not allow white light to pass through. Here, color filter L1. Since G and lt are additive, the part where they match becomes optically black, which hardly transmits light in the entire wavelength range. After all, color filter L1.
G and R cover the entire surface of one glass substrate 22, so even if for some reason there is a light path around the electrode, it will always pass through one of the color filters B, a, or ii. There is a possibility that white light will leak out, so there will be no white or black streaks on the photosensitive paper. Molecular orientation layer 29 for molecular orientation treatment
．． 30 are provided. On the other hand, such a liquid crystal shutter 2
A self-off lens array 27 is located in front of the camera (lower in the figure).
is provided so that the colored light passing through the liquid crystal shutter 20 can be projected onto the color photosensitive paper 28 in a non-contact manner. If high resolution is not required, this self-off lens array 27 may be omitted.

The liquid crystal printer head having the color liquid crystal display element configured as described above can arbitrarily copy characters, figures, patterns, etc. in color, and can reliably prevent the occurrence of white streaks or black streaks on the photosensitive paper 28. In addition, each color is completely separated, and prints with good color reproduction can be obtained without color mixing. Conventionally, when colorizing a liquid crystal, it was sufficient to cover only the top surface of one of the transparent electrodes with a color filter. However, in reality, in LCD printers using liquid crystal shutters with this configuration, white light leaked from around the electrodes, causing white or black streaks on the photosensitive paper. As mentioned above, the invention solves the conventional drawbacks by covering the entire surface of the transparent electrode 26 on the liquid crystal side with color filters B, G, )t and at the same time forming a light-shielding layer around the electrode that does not allow at least white light to pass through. Optical black dyeing may be applied as a light-shielding layer to most effectively prevent the occurrence of white streaks or black streaks.

As long as white light does not pass through, white streaks and black streaks can be sufficiently prevented and are not noticeable. Therefore, the filter is not limited to such a filter, and any color filter of the above embodiment that does not transmit white light may be used.

FIG. 4 is an embodiment showing one configuration that can achieve the object of the present invention, and the same components as in FIG. 3 are indicated by the same symbols. The entire surface of the transparent electrode array 26, 36, 46 on one side of the liquid crystal shutter 20 is covered with color filters H, U, R of different colors, and different color filters adjacent to each other are arranged on the glass substrate 22. The edges of the color filter i3.0.1 (for each electrode) extend out to the gap between the transparent electrodes and overlap each other.The entire surface of the color filter layer is are covered with a protective layer 51. This protective layer 51 allows the color filter layers B and G provided on the electrode surface, and the light-shielding layer covering between the electrode arrays to be covered with a protective layer 51 without directly applying molecular orientation treatment to the filter surface. After coating, molecular orientation treatment is applied on top of the coating, which helps prevent dyes etc. from entering the liquid crystal from the color filter and discoloration of the filter.The material for forming the protective layer is transparent For example, a photocurable resin, which is an organic or inorganic material and does not have a chemically adverse effect on either the filter layer or the liquid crystal layer, is suitable.Providing such a protective layer is also suitable for the color filter layer. This is also advantageous because it increases the degree of freedom in the undercoating method for improving the adhesion of the colored resin material to the transparent electrode or glass substrate used to form the light-shielding layer.

As specifically explained above based on the embodiments, the color liquid crystal device according to the present invention can reliably prevent the leakage of white light. No streaks or black streaks (you can obtain excellent image quality without color mixture.

[Brief explanation of the drawing]

Figures 1 (a) and 4 (b) are diagrams of the operating principle of a TN liquid crystal, Figure 2 is a sectional view of a conventional color liquid crystal display element, and Figures 3 and 4 are color liquid crystal display elements according to the present invention. 1 is a cross-sectional view of a liquid crystal printer head using the device. In the figure, 20 is a liquid crystal shutter, 21.22 is a glass plate, 23.24 is a polarizing plate, 25.26 is a transparent electrode, 27 is a self-off lens array, 28 is a color photosensitive paper, and B, G, and R are color filters. It is. Figure 1 (a) Batting power Figure 3 Figure 2 Figure 4 Procedural amendments December 27, 1980 Dear Commissioner of the Japan Patent Office 1 Indication of the case 1988 Patent application No. 11406 Bow Showa 61
Publication Year No. 2, Issued by BAF) Name
Relationship with Color Hikari Buri, Tahead 3, J+li Correct Person's Cry '1 Patent Applicant Postal Code 250 4, Attorney Voluntary 6, ``Claims'' and ``Detailed Description of the Invention'' of the specification to be amended ” and “Brief description of drawings” columns. 7. Amend the detailed description of the amendment as shown in the attached attached document, ``Full text revised description'' (no changes to the contents except for the matters stated in the column subject to amendment). 8. List of attached documents Full text correction statement 1 full text correction specification 1. Title of invention Color optical printer head 2. Claims (1) Plural liquid crystals having color filters of different colors corresponding to each separated color A shutter array, one of two glass substrates on which this liquid crystal shutter array is formed.
In a color optical printer head having a liquid crystal shutter array in which the liquid 1 side surface of a transparent electrode provided on one glass substrate is covered with a color filter, A color optical printer head characterized in that a light shielding layer that does not transmit at least white light is formed between transparent electrodes covered with color filters. (2) A plurality of liquid crystal shutter arrays having color filters of different colors corresponding to each separated color, and one of the two glass substrates on which the liquid crystal shutter array is formed.
In a color optical printer head having a liquid crystal shutter array in which the liquid crystal side surface of a transparent electrode provided on one glass substrate is covered with a color filter, colors that are adjacent to each other and different in color on the one glass substrate are provided. A light-shielding layer that does not transmit at least white light is formed between the transparent electrodes covered with the filter, and further, the entire surface covered with either the color filter layer or the light-shielding layer is a protective layer made of a photocurable resin. A color optical printer head characterized by being covered. 3. DETAILED DESCRIPTION OF THE INVENTION -1\ The present invention relates to a color optical printer head that prints characters, figures, etc. in color on a photosensitive material using light, and particularly to an optical shutter device suitable for application to a color hard copy device. Currently, liquid crystal elements are widely used as numeric displays in calculators and wristwatches, and further development is underway into dot matrix displays that can display alphanumeric characters, kanji, kana characters, images, etc. as desired. Most of these devices are black and white display devices using the TN (twisted nematic) method. The principle diagram of this TN system is shown in Figure 1 (a).
2-4! A nematic liquid crystal is sandwiched between glass substrates 1 and 2, and the molecules 5 of the liquid crystal are gradually twisted so that their long sleeves are parallel to the substrate surface and the direction extends in the thickness direction (when no electric field is applied, the first Figure (a)). Moreover, the twist angle from one glass substrate l to the other glass substrate 2 is 90
It has become a degree. Furthermore, before and after such a liquid crystal cell,
Polarizing plates 3.4 whose polarization directions are orthogonal to each other are installed. Therefore, when white light is incident on such a liquid crystal device from the rear, this light passes through the polarizing plates 3 and is polarized in one direction, and then enters the liquid crystal and propagates along the liquid crystal molecules 5, Its polarization direction is rotated by 90°. For this reason,
The polarization direction of this polarized light matches the polarization direction of the front polarizing plate 4, and this polarized light passes through the polarizing plate 4 without being blocked. On the other hand, when an electric field is applied in the thickness direction of the liquid crystal, the long axes of the liquid crystal molecules 5 are aligned in the direction of the electric field, as shown in FIG. 1(b). Therefore, when white light is incident on the element from behind, the light passes through the polarizing plate 3, is polarized in one direction, and then propagates through the liquid crystal as it is. Therefore, the polarization direction of this polarized light remains perpendicular to the polarization direction of the polarizing plate 4 in front, and this light is blocked by the polarizing plate 4. When an electric field is applied in this way, the liquid crystal cell becomes opaque,
TN liquid crystal is used as a display element by applying the operating principle that a liquid crystal cell becomes transparent when no electric field is applied. However, most of these TN type liquid crystal elements have been transparent or opaque for black-and-white display, so as the uses of liquid crystal confectionery have expanded, colorization has become desirable. This is because colorization can be expected to bring novelty, visibility, and diversity to the display, and some display systems can provide a wide viewing angle. Color display systems using liquid crystals that utilize various principles have been proposed. A typical example is ECB (electrically
controlled birefringence)
method, GH (guest
-host) method, color T in which a dichroic or birefringent color filter is covered with the above-mentioned TN method element.
There is N method. FIG. 2 shows this color TN liquid crystal element. The device shown in the figure is a combination of red, green, and blue color filters to enable multicolor display. That is, the nematic liquid crystal 12 is sandwiched between two parallel glass X substrates 10 and 11, and the glass substrate 1
A large number of band-shaped transparent electrodes 13 and 14 are deposited on the inner surface of the electrode 0.11 so as to sandwich the liquid crystal 12 and intersect with each other at right angles. Therefore, by combining the facing portions of the transparent electrodes 13 and 14 and applying an electric field, it is possible to display any shape or pattern, that is, matrix display. Further, color filters B, G, and R are formed on the transparent electrode near the surface of such a liquid crystal element, and on the transparent electrode 13 located at the bottom in the figure, respectively. Here, color filter R transmits red light, and color filters B and G are additive color filters that transmit green light and blue light, respectively. The reason why the color filters B, G, and R'i are provided at such positions is that it is easier to obtain high resolution by placing the color filters in close contact with the transparent electrode, and also because the color filters are placed in close contact with the transparent electrode 14 at a shallow position in front of the rear transparent electrode 14. This is because providing it on the electrode 13 causes less color shift when viewed from an angle. By the way, since the liquid crystal becomes transparent and opaque according to the principle shown in FIG. 1, when a transmissive display is adopted as the display method, the liquid crystal functions as a light shutter. Recently, a liquid crystal printer head has been developed in which a liquid crystal device vIL with such a function is applied to the shutter of a copying machine (Nikkei Elect o Nisku, 1982.5.10 P2O-
P92). This liquid crystal 7' link head has a structure in which a fluorescent lamp is installed as a light source behind a liquid crystal shutter, and the fluorescent lamp is irradiated onto a photosensitive drum through a photoacoustic imaging system controlled by the liquid crystal shutter. It has been reported that a liquid crystal shutter array has 2000 shutters arranged horizontally in a staggered manner with a pinch of 100 μm, and has a viewing angle of 10 lines/dragon angle Aε. Such optical printer heads can achieve printing quality comparable to that of conductor laser printers, and are generally cheaper than laser printers, so their development is desired, but conventional liquid crystal printer heads are simply It was just a black and white display. Therefore, the inventors of the present invention repeatedly considered colorizing the printer head using the color TN method described above, and as they continued their experiments, they found that light leaked from around the transparent electrodes and caused black streaks on the photosensitive paper (negative working photosensitive paper). In the case of positive working photosensitive paper) or white streaks (in the case of positive working photosensitive paper), we have found a problem in which the image quality is significantly impaired. Therefore, the present invention provides a color liquid crystal device tube that prevents white light from leaking around transparent electrodes, and also produces black streaks or white streaks on prints due to the light on/off control process by the liquid crystal shutter array. To provide a printer head capable of obtaining prints with improved color reproduction by preventing color mixing of different colors that may occur between adjacently arranged transparent electrodes (corresponding to pixels). The purpose is to The present invention is based on the findings from the above-mentioned colorization study experiment, and has been developed to prevent white streaks (in the case of negative working photosensitive paper, black In order to prevent the occurrence of "streaks", a practical means must be devised to prevent at least the white light from reaching the 11uK output from any part other than the transparent electrode section, no matter what optical path it follows from the light source side through this liquid crystal shutter. is its basic technical philosophy. The structure of the present invention is an optical printer head using a liquid crystal shutter array, which has a plurality of shutter arrays corresponding to separation colors for color, and each of a plurality of transparent electrodes forming the plurality of liquid crystal shutter arrays. The electrode surface is surrounded by color filters of different colors corresponding to the separated colors, and is covered with the color filters of different colors to form a light-shielding layer that does not transmit at least white light between the transparent electrodes arranged adjacent to each other. It is characterized by Another configuration of the present invention is that an optical printer head using a liquid crystal shutter array has a plurality of liquid crystal shutter arrays corresponding to each color separation, and a plurality of liquid crystal shutter arrays forming the plurality of liquid crystal shutter arrays. The surface of each of the transparent electrodes is covered with a color filter of a different color corresponding to the separated color, and a light-shielding layer that does not transmit at least white light is provided between the transparent electrodes arranged adjacent to each other by the different color filters. Further, the entire surface of either the color filter layer or the light-shielding layer is covered with a protective layer made of a photocurable resin. Hereinafter, the color printer head according to the present invention will be described in detail based on examples. FIG. M3 and FIG. 4 show an embodiment in which the color liquid crystal device according to the present invention is applied to a liquid crystal printer head as a liquid crystal shutter. The liquid crystal printer head shown in Figure 3 includes a fluorescent lamp as a light source, a liquid crystal shutter that colors the fluorescent light as it passes through, and a self-off lens array that projects the colored light onto color photosensitive paper. equip Immediate flashlight (
A liquid crystal shutter array 2o is provided in front (lower in FIG. 3) of the shutter (not shown). The liquid crystal shutter array 2o has a plurality of transparent polar arrays 25, 26: 35, 36: and 45 corresponding to different colors.
, 46 : are formed between the glass substrates 21 and 22 at regular intervals at predetermined intervals in the direction perpendicular to the plane of the paper.
It has a structure in which o is inserted in between. Polarizing plates 23 and 24 are respectively attached to the outer surfaces of the two glass substrates 21 and 22, that is, the surfaces opposite to the transparent electrode side. The glass substrate 21
．． The thickness of the p1 liquid crystal 60 is about 1 ysm to 2 mm, and the thickness of the p1 liquid crystal 60 is 10 to 20 μm 8 F. As described above, when a voltage is applied to this liquid crystal 60, the polarization direction i
It has an optical rotation that rotates it by 90 degrees, and also has a polarizing plate 23.24.
The polarization directions of are mutually orthogonal. Therefore, only the portion of the liquid crystal to which a voltage is applied transmits light and is bright, while the other portions are blocked from light. The size of the electrode is about 80 pm square.
The gap between adjacent electrodes on the glass substrate is about 20 pm. Also, the play interval is 1100p or more 1000p
~2000 pnia degrees. In addition, generally the transparent electrode 25
．． The material of 26 etc. is Int03, 1112 o3
A transparent electrode is formed by vapor depositing on a glass substrate. Since the transparent electrodes 25, 26, etc. are arranged in a don't-matrix pattern, arbitrary characters, figures, etc. can be displayed. In non-implemented flJ, the individual transparent electrodes corresponding to the shutter opening corresponding to the unit pixel are arranged independently in the form of dontomatolinks, but in some cases, the second
In the transparent electrode portions facing each other through the liquid crystal, such as the liquid crystal device shown in the figure, at least one of the upper electrode 13 and the lower electrode 14 in the figure is a common linear electrode, and both electrodes are polarized. to which a predetermined potential is applied (electrode 13 in the figure)
It goes without saying that the present invention can also be applied to a liquid crystal shutter array of the type in which the portion where the lines 14 and 14 intersect in a plane) performs an optical shutter operation. Returning to the explanation of the above embodiment, the transparent electrodes 26, 36, 46 on one glass substrate of the transparent electrode array corresponding to each color
is a color filter B whose entire surface is a different color.
, G, and R, and in addition, in the areas of the adjacent transparent electrodes 26-36, 36-46 on the glass substrate 22, the ends of the color filters B, G, and R protrude and overlap each other. They overlap. B, G, and R may be arranged on the substrate in a mosaic or zigzag pattern, or three colors may be arranged as a group. color filters B, G, which are laminated on the transparent electrode 26;
R functions as an original color filter, while color filters B, G, and R formed between the electrodes overlap each other and are provided 6 as a light-shielding layer that does not allow white light to pass through. Here, since the color filters B, G, and R are additive, the overlapping portion becomes optically black through which almost no light in the entire wavelength range passes. In the end, color filters B and G
, R will cover the entire surface of one of the glass substrates 22, so even if there is a path of light around the electrode for some reason, it will always pass through one of the color filters B, G, and R and become white. No light leaks, and therefore no white or black streaks occur on the photosensitive paper. Furthermore, the surfaces in contact with the liquid crystal, such as the inner surface of the glass substrate, the surface of the transparent electrode, the color filter layer, and the light shielding layer, are covered with a molecular alignment layer for molecular alignment treatment.
On the other hand, such a liquid crystal shutter array 2
A self-off lens array 27 is located in front of the camera (lower in the figure).
is provided so that the colored light can be projected through the liquid crystal shutter array 20 onto the color photosensitive paper 28 in close proximity and in a non-contact state.If high resolution is not required, This self-off lens array 2ft-
It can be omitted. The liquid crystal printer head having the color liquid crystal display element configured as described above can copy characters, figures, patterns, etc. in color as desired, and can completely prevent the occurrence of white streaks or black streaks on the photosensitive paper 28. Moreover, each color is completely separated, so that color mixing does not occur and prints with good color reproduction can be obtained. Conventionally, when colorizing a liquid crystal, it was thought that it would be sufficient to cover only the upper surface of one of the transparent electrodes with a color filter. However, in reality, in a liquid crystal printer using a liquid crystal shell having such a structure, white light leaks from around the electrodes, resulting in white or black streaks on the photosensitive paper. Therefore, as described above, the present invention covers the entire surface of the transparent electrode 26 on the liquid crystal side with color filters B, G, and R, and at the same time forms a light-shielding layer around the electrode that does not transmit at least white light. This is the one that has been resolved. Optical black dyeing may be applied as a light-shielding layer to effectively prevent the occurrence of white streaks or black streaks in general. As long as the white light does not pass through, white streaks and dark spots can be sufficiently prevented and will not be noticeable. Therefore, it is not limited to such filters, but at least the color filters of the above embodiments that do not allow the white light to pass through can be used. The fourth section is the purpose of the present invention.
This is an embodiment showing another configuration that can be achieved, and the same components as in FIG. 3 are indicated by the same symbols. Transparent tm26.3 on one side of the liquid crystal shutter array 20
6.46 is a color filter B whose entire surface has a different color,
These color filters B, G,
The R ends are overhanging and overlap each other. The entire surface of these color filter layers is covered with a protective layer 51 so that they do not come into direct contact with the liquid crystal 60. With this protective layer 51, the color filter layers B, G, R provided on the electrode surface and the light shielding layer covering between the transparent electrodes are not directly subjected to molecular alignment treatment, but the filter surface is coated and then molecular alignment treatment is applied thereon. This will help prevent dyes etc. from leaking from the color filter to the liquid crystal and discoloration of the filter. The material used to form the protective layer may be a transparent organic or inorganic material that does not have a chemically adverse effect on either the filter layer or the liquid crystal layer, such as a photocurable resin. Are suitable. In addition, providing such a protective layer increases flexibility in the method of undercoating to improve the adhesion of colored resin materials to transparent electrodes and glass substrates for forming color filter layers and light-shielding layers, for example. It's very convenient. As specifically explained above based on the embodiments, the color liquid crystal device according to the present invention can reliably prevent the leakage of white light. You can obtain excellent image quality with no black streaks or color mixture. 4. Brief explanation of the drawings Figures 1 (a) and (b) are diagrams of the operating principle of a TN liquid crystal, Figure 2 is a cross-sectional view of a conventional color liquid crystal display element, and Figures 3 and 4 are from this book. 1 is a sectional view of a liquid crystal printer head using a color liquid crystal element according to the invention; FIG. In the drawing, 20 is a liquid crystal shutter array, 21.22 is a glass plate, 23.24 is a polarizing plate, 25.26 is a transparent electrode, 27 is a self-off lens array, 28 is color photosensitive paper, 29.30 is a molecular alignment layer , 51 is a protective layer, 60 is a liquid crystal, and B, G, and R are color filters. Patent Applicant - Fuji Photo Film Co., Ltd. Agent Patent Attorney Shibe Mitsuishi (and 1 other person) Procedural Amendment 1982 2/I 2 , +1 Commissioner of the Japan Patent Office J, Indication of Case 1982 Patent Application No. 11406 Shibo Showa
Publication year: 2, Title of the invention: Color optical printer head 3, Capturing each type II ('l) Patent applicant postal code: 2
6″θ Fuji Photo Film Co., Ltd. 4, 210 Nakanuma, Minamiashigara City, Kanagawa Prefecture (520), Agent Postal Code 107 Voluntary (N
5) 6. Subject of amendment Column 7 of "Detailed explanation of the invention" of the full text corrected specification attached to the procedural amendment submitted on December 27, 1988, Contents of the amendment (1) Full text corrected specification No. 5 Page 16th line and 6th
"Electrode 13" written on the fourth line of the page is replaced by "Electrode 14".
”. (2) "Electrode 14J written on page 6, line a of the full text suspension specification is corrected to "electrode 13J." (3) "... at the same time... written on page 14, line 8 of the full text correction specification... "..." is corrected to "-...both...".

Claims (1)

[Scope of Claims] 1) A plurality of liquid crystal shutter arrays corresponding to the separated colors are provided, and the surfaces of the plurality of transparent electrodes of the shutter array are covered with color filters of different colors corresponding to the separated colors. 1. A color optical printer head using a liquid crystal shutter array, characterized in that a light shielding layer that does not transmit at least white light is formed between mutually adjacent transparent electrodes of different colors. 2) It has a plurality of liquid crystal shutter arrays corresponding to each separated color, and the surface of the general transparent electrode of the shutter array is covered with a color filter of a different color corresponding to the separated color. In the optical printer head used, a light-shielding layer that does not transmit at least white light is formed on the substrate between adjacent transparent electrode rows of different colors.
A color optical printer head characterized in that the entire wide surface is covered with 41 layers of photocurable resin. Emperor 111